Where is your old Mac? Or do you have another Mac you can borrow/use to do this? Again the easiest way is to set up networking between a PC and a Mac, or maybe even easier just copy the sessions on that hard drive (while it is attached to a Mac) to a USB memory stick (or an external SSD like a Samsung T5) formatted as exFAT.

If your ex-friend lead you in the wrong direction like it seems, and then abandoned you should hunt them down and...